π-Allyl Type Polymerization

Abstract

He received his PhD degree from the University of Louvain (Belgium) with Professor G. Smets, and he studied as research associate of the University of Arizona (Tucson, USA) under Professor C. S. Marvel. His main research interests are stereospecific polymerization mechanisms and synthesis and properties of new polymers. Successively Assistant at the University of Louvain (Belgium) , Professor at Lovanium University (Congo), Research Associate at Brooklyn Polytechnic Institute (N. Y.), and Senior Chemist at the Institut Frangais du Petrole (Paris), Dr. Philippe Teyssie is now Professor of Organic Chemistry a the

Stereochemical control of 1,3‐diene polymerization

“…polymerization of butadiene-l,3 with h3 -crotyl nickel iodide proceeded through successive insertions of diolefin molecules at the h3 -allylic ligandmetal bond, a syn h3-crotyl structure for the active unit being reproduced after each insertion. A h3-allylic structure was also assigned to the adducts of h3-crotyl nickel iodide and butadiene-1,3 homologs: isoprene; 2-ethyL; 2-isopropyl-; 2-tert-butylbutadienes-l,3; cis-and trans-pentadienes-l,3 ; 4-methylpentadiene-1,3 (1 [5][6][7][8][9][10][11][12][13][14][15][16][17]. Adducts of h3-crotyl nickel iodide and 2-alkylbutadienes-l,3 were 1,2-disubstituted h3 -allylic complexes, with the syn-anti isomers ratio being dependent on the bulk of the subsituent occupying the central carbon atom of the allylic ligand.…”

High Catalytic Activity and Stereoregularity of BF3 Etherate as Cocatalyst of Nd-Based Catalyst in the Polymerization of 1,3-Butadiene

“…A Lewis base containing heteroatom such as sulfur, 25 even at low concentrations, deactivates the active center of Ziegler-Natta catalyst based on transition metal by complexing with it, thereby obstructing the approach of monomer to give low conversion. Block of active center impedes 26 cisoid coordination of monomer with active center to give low 1,4-cis content. Nd-based catalysts may thus have stronger endurance to electron donor in catalytic activity and stereoregularity than the conventional Ziegler-Natta catalysts based on cobalt 25 and nickel.…”

NMR Analysis of Stereo Regular Copolymers

“…1,2-/1,4-Cis-or 1,2-/1,4-TransPolybutadienes Several procedures are available for preparing polybutadienes that contain equal amounts of 1,4-cis and 1,2-units [104,105]. The structures of these "equibinary " polymers have been investigated extensively by cmr spectroscopy [21,22,106,107].…”